The WhisperGreen™ Series of ventilation fans feature Custom Vent™ variable-speed control with a delayed off timer that allows the fan to run continuously at a preset lower level (30 to 110 cfm). The fan then elevates to a maximum level of operation (110 cfm) when the switch is turned on, or the SmartAction™ motion sensor is activated. The delayed off timer returns the fan to the minimum cfm level after a period of time set by the uer.

- Panasonic
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